EP0961215A1 - Control device for marking device - Google Patents

Control device for marking device Download PDF

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Publication number
EP0961215A1
EP0961215A1 EP99116604A EP99116604A EP0961215A1 EP 0961215 A1 EP0961215 A1 EP 0961215A1 EP 99116604 A EP99116604 A EP 99116604A EP 99116604 A EP99116604 A EP 99116604A EP 0961215 A1 EP0961215 A1 EP 0961215A1
Authority
EP
European Patent Office
Prior art keywords
scanning
image
marking
pattern
display screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99116604A
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German (de)
English (en)
French (fr)
Inventor
Masashi c/o K. K. Komatsu Seisakusho Ichihara
Yukinori c/o K. K. Komatsu Seisakusho Matsumura
Akira c/o K. K. Komatsu Seisakusho Mori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
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Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Publication of EP0961215A1 publication Critical patent/EP0961215A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/066—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing

Definitions

  • the present invention relates to a device for controlling a marking device designed to mark a predetermined pattern on a work, and in particular relates to a control device capable of performing high-speed marking.
  • a need for reducing the marking time has recently arisen in the technical field related to marking devices, including laser markers.
  • a laser beam bm strikes the display screen 10 of the liquid-crystal mask 6 , and the entire display screen 10 is marked by scanning the laser beam, as shown in Figure 16.
  • Main scanning of the display screen 10 in the X direction is effected by the rotation of a polygonal mirror 3
  • sub scanning in the Y direction is effected by the rotation of a scanning mirror 2 .
  • Such a stepwise scanning mode does not pose any problems when the polygonal mirror 3 rotates at a low speed and the main scanning is performed at a low speed, but it is impossible to track when the main scanning is performed at a fast speed, and undesirable vibration results.
  • An object of the present invention which was devised in view of this situation, is to reduce the marking time by raising the scanning speed of the display screen of the mask without impairing the tracking properties or bringing about other disadvantages.
  • an image 33 is divided into the image segments 19 of the predetermined size, these image segments 19 are sequentially displayed on the display screen 10 of a liquid-crystal mask 6 , and actuators 12 and 16 for switching an image-segment exposure position 17a on a work 17 are driven in controlled fashion every time the display is switched.
  • the dimensions of the image 33 and image segments 19 often vary with the type of device and correspond to rectangular shapes with varying longitudinal and transverse dimensions.
  • the display switching sequence for image segments 19 was unconditionally defined as a sequence involving a large number of travel cycles in the transverse direction, as shown, for example, in Figure 24, so it was necessary to move the image-segment exposure position 17a over long distances along the work 17 with the aid of the actuators 12 and 16 every time the display was switched for an image segment with a large size in the transverse direction. This meant an extended marking time.
  • the preparation time needed to start such sub scanning is a dead time that produces no actual scanning or marking, and this must be reduced in order to reduce the marking time.
  • a general object of the present invention is to provide a control device capable of reducing the marking time in a marking device.
  • control device of a marking device of the present invention is defined by claim 1.
  • the essence of the present invention is a control device of a marking device which is provided with a scanning device for exposing the display screen of a mask to light and subjecting the exposure light both to main scanning at a predetermined speed in the X direction across the display screen and to sub scanning at a predetermined speed in the Y direction that is perpendicular to the X direction, and in which an image indicative of a pattern to be marked is displayed on the display screen of the mask, and the light is scanned by the scanning device, thereby guiding the light passing through the mask toward a work and marking the pattern on the work, wherein the scanning device is controlled in such a way that the sub scanning is performed at a constant speed during the sub scanning of the display screen of the mask.
  • the invention involves performing sub scanning at a constant speed during the sub scanning of the display screen 10 of the mask 6 , as shown in Figure 15, making it possible to raise the scanning speed and reducing the marking time without adversely affecting tracking or causing other problems.
  • Figure 1 illustrates the concept of the entire structure of the laser marker pertaining to the embodiments.
  • a laser oscillator 1 oscillates scanning laser beam (for example, YAG laser beam), and the oscillated laser beam strikes a reflecting surface 2a of a scanning mirror 2 , which is a Y-direction deflector.
  • scanning laser beam for example, YAG laser beam
  • Laser light reflected by the reflecting surface 2a passes through a lens 4 and strikes a reflecting surface 3a of a polygonal mirror 3 , which is an X-direction deflector.
  • Laser light reflected by the reflecting surface 3a passes through a lens 5 and strikes, for example, a liquid-crystal display screen 10 of a macromolecular composite-type liquid-crystal mask 6 .
  • the reflecting surface 2a of the scanning mirror 2 is rotated in the direction of arrow AA by a motor 8
  • the reflecting surface 3a of the polygonal mirror 3 is rotated in the direction of arrow BB by a motor 9 . Therefore, laser light performs main scanning for the display screen 10 of the liquid-crystal mask 6 in the direction of the arrow X as a result of the fact that the motor 9 is driven in controlled fashion and the reflecting surface 3a is rotated in the direction of arrow BB
  • the laser light performs sub scanning for the display screen 10 of the liquid-crystal mask 6 in the direction of the arrow (Y) as a result of the fact that the motor 8 is driven in controlled fashion and the reflecting surface 2a is rotated in the direction of arrow AA .
  • the manner in which the laser beam bm scans the screen 10 is illustrated in Figure 15 described later.
  • a controller 7 controls the scanning of laser light across the screen 10 of the liquid-crystal mask 6 by driving the motors 8 and 9 in controlled fashion and controlling the laser oscillation of the laser oscillator 1 .
  • the controller 7 controls display switching in such a way that an original image indicative of the marking pattern to be marked is divided into image segments of predetermined size, as described below, and these are sequentially displayed on the display screen 10 .
  • Motors 12 and 16 are actuators for moving, in the X and Y directions, that position 17a on the work 17 which is to be exposed to the light transmitted through the mask 6 , so that the pattern of image segments is marked in the corresponding area 17a of the work 17 .
  • the controller 7 drives the motors 12 and 16 in controlled fashion.
  • data concerning an original image 18 indicative of, for example, the "ABCDE” marking pattern shown in Figure 2 below are input with the aid of a predetermined input means such as a scanner, and the controller 7 , once the dividing procedure described below has been performed, outputs drive signals for driving pixels of the liquid-crystal screen 10 in accordance with the pattern of the image segments 19 in such a way that the image segments 19 are displayed on the display screen 10 of the liquid-crystal mask 6 .
  • the pattern segments of "ABCDE” correspond to logical "1”
  • the background segments other than the pattern segments correspond to logical "0".
  • the motors 8 and 9 are then driven in controlled fashion, as is the laser oscillator 1 , and scanning is performed with the aid of laser light, which passes only through the aforementioned driven pixel portion (logical "1" pixels).
  • Laser light transmitted through the liquid-crystal mask 6 passes through a reflecting mirror 11 which is a Y-direction deflector, a lens 13 , a lens 14 which is an X-direction deflector and a movable table 15 whereon the lens 14 is mounted , strikes the corresponding area 17a of the work 17 , and the pattern of image segments 19 is marked on the work 17 .
  • the reflecting surface of the reflecting mirror 11 is rotated in the direction of arrow CC by the motor 12 , and the exposure position 17a on the work 17 is switched in the Y direction.
  • the table 15 is moved in a reciprocated fashion in the direction of arrow DD by the motor 16 , and the exposure position 17a of the work 17 is switched in the X direction.
  • the motors 12 and 16 are not driven, and when another image segment 19 is displayed on the liquid-crystal mask 6 , the motors 12 and 16 are driven in controlled fashion, and the reflecting mirror 11 and lens 14 move in such a way that the marking position 17a that corresponds to the next image segment is exposed to light.
  • the image segments 19 of Figure 2 are thus sequentially marked on the work 17 , and the entire original image 18 is ultimately marked on the work 17 .
  • Figure 14 illustrates a flow chart for the dividing procedure of the first embodiment. A description will be given below with reference to Figures 2 through 4.
  • Step 201 it is first determined whether or not there is a logical "1" pixel in the uppermost row of the original image 18 (Step 201 ), and as long as there are only pixels that represent a logical "0" background rather than logical "1"s, the procedure is repeated for successive rows in the downward direction to determine in a similar manner whether there is a logical "1" pixel in each row (Step 202 ).
  • a line representing a logical "1" "ABCDE” marking pattern is eventually identified (“YES” in Step 202 ), and this results in the detection of the upper end 20a of a circumscribed rectangle that circumscribes the entire marking pattern (Step 203 ).
  • Step 204 the same search is performed until no more rows with logical "1" pixels are identified at all, and the lower end 20b of the circumscribed rectangle 20 is detected.
  • Step 208 The same search as that performed in Steps 201 and 202 above is subsequently carried out in the column direction starting from the right column (Steps 205 and 206 ), the right end 20c of the circumscribed rectangle 20 is detected (Step 207 ), and the left end 20d of the circumscribed rectangle 20 is detected in the same manner (Step 208 ).
  • the images of this circumscribed rectangle 20 are divided into image segments 19 .
  • the following method can, for example, be adopted for determining the number of divisions.
  • division should be performed using the number of divisions n1,1 ⁇ m1,1, which is determined by the minimum natural numbers n1,1 and m1,1 that satisfy the relations ⁇ 1,1 ⁇ n1,1 ⁇ x ⁇ 1,1 ⁇ m1,1 ⁇ y where, as shown in Figure 5, x and y are the transverse width and longitudinal width of an image segment 19 , respectively, and ⁇ 1,1 and ⁇ 1,1 are the transverse width and longitudinal width of the circumscribed rectangle 20 , respectively (see Figure 4).
  • the first embodiment is thus aimed at allowing only the "ABCDE” marking pattern to be actually marked on the work 17 , and involves forming an image in the form of a circumscribed rectangle that circumscribes the "ABCDE” marking pattern and switching the display of the image segments within this circumscribed-rectangle image, with the result that the required time for marking is markedly reduced because the number of divisions reduces the number of cycles needed to switch the display of the entire original image 18 in comparison with cases in which the display of these image segments is switched for the entire original image 18 including image segments of only blank portions.
  • the aforementioned embodiment is satisfactory when the marking pattern itself is an integrated design.
  • Figure 13 is a flow chart which illustrates the manner in which the "ABCDE" marking pattern shown in Figure 2 is separated into individual patterns A, B, ..., and which depicts the dividing procedure performed for each pattern section. A description will be given below with reference to Figures 6 through 12.
  • Step 101 the same procedure as that in Figure 14 above is first performed, a rectangle 20 (see Figure 3) circumscribing the entire marking pattern is formed (Step 101 ), and the numbers of divisions n1,1 and m1,1 for the circumscribed area image 21 that corresponds to the circumscribed rectangle 20 are calculated using Relation 1 above (see Figure 4; Step 102 ). These numbers of divisions n1,1 and m1,1 are stored in a memory (Step 103 ).
  • Each row of the image 21 is then analyzed to determine whether or not all the pixels in these rows are logical "0"s, a background segment 21a , which is a space between the upper and lower patterns and which extends in the horizontal direction (X direction), is thus identified (see Figure 4), and this background segment 21a allows the "ABCDE” marking pattern to be separated into k (in this case, two) patterns, "ABC” and "DE” (see Figure 6; Step 104 ).
  • the pattern separation number k is stored in the memory (Step 105 ).
  • the following determination criterion is used in this case: a comparison is made between the numbers of divisions n1,1 and m1,1 obtained by dividing into the image segments 19 the area image 21 circumscribing the entire "ABCDE" pattern prior to separation, and the combined value of the numbers of divisions n2,1, m2,1 and n2,2, m2,2 obtained when the area images 24 and 25 circumscribing the separate "ABC” and "DE” patterns are divided into the corresponding image segments 19 , and the decision to perform the separation is made only when the combined value of the numbers of divisions after separation is lower than the number of divisions before separation. Further separation is meaningless because the number of divisions is not changed as a result of separation.
  • Relation 2 can be adopted as a criterion for deciding whether or not to perform division when separation into k patterns is possible.
  • p is the number of image segments 19 accounted for by background segments only (for example, the three lower right image segments correspond to this number in the case of the images 21 in Figure 4) (Step 107 ).
  • Step 108 the corresponding separation is adopted (Step 108 ), and if not satisfied, no separation is adopted, it is assumed that further separation is impossible, and a decision is made to ultimately adopt the image of Figure 4.
  • Step 111 I and J are each initialized to one (Step 111 ), and the corresponding numbers of divisions n and m are calculated for a pattern obtained by connecting together the I-th to J-th pattern sections in the direction from left to right, as well as for the (J + 1)-th pattern section (Step 112 ). It is then determined whether or not the aforementioned separation is appropriate, using the same procedure as in Step 107 above (Step 113 ).
  • Steps 114 and 115 the "A" and "B" patterns not to be separated are re-merged, and it is determined whether to separate this "AB" pattern from the adjacent "C” pattern on the right. If the separation is to be performed, the right side pattern of the pattern sections involved is adopted as the left border, and it is determined in the same manner whether to perform separation from the adjacent pattern on the right, This procedure is repeated (r-1) times.
  • Step 117 Thereafter i is changed in +1 increments (Step 117 ), the same procedure is performed (Steps 112 through 116 ), it is finally determined whether the numbers of divisions n3,3 and m3,3 are at a minimum and there is no need to further separate the lower "DE" pattern section (see Figure 10; "NO” in Step 118 ), and the entire procedure is completed.
  • circumscribed area images 30 , 31 and 32 corresponding to the circumscribed rectangles 29 , 28 , and 23 of the "AB,” “C,” and “DE” pattern sections are thus formed for each of the patterns, the image segments 19 constituting these circumscribed area images 30 , 31 , and 32 are sequentially retrieved, switched, and displayed, making it possible to markedly reduce the marking time by performing the minimum number of switching cycles.
  • This control is to perform marking in such a way that the positional relationship between the circumscribed area images 30 , 31 , and 32 remains the same as the positional relationship of the original circumscribed area image 21 of Figure 4, even when separated into pattern sections ("AB,” "C,” and "DE").
  • the drive amounts of the motors 12 and 16 for marking the pattern of each image segment 19 at the corresponding position 17a on the work 17 are calculated for each of the image segments 19 on the basis of these coordinate positions.
  • the amount of drive may be calculated following the completion of the aforementioned separation and division procedures ( Figure 13) or in the process of performing these separation and division procedures.
  • magnification of the lens 13 is designated “s”
  • magnification of the lens 14 is designated “t.”
  • the image displayed on the liquid-crystal mask travels a distance of (1 + t)a across the work 17 when the lens 14 has traveled a distance a (see Figure 30(b)).
  • the image movement is unrelated to the magnifying power of the lens 13 .
  • the positions occupied by the lens 14 being moved by each of the motors are designated as TX and TY.
  • the magnification of the lens 13 is designated "u”
  • the magnification of the lens 14 is designated "v.”
  • the amounts of drive are subsequently calculated in the same manner, the pattern of each image segment 19 is successively marked, and the entire "ABCDE" pattern is ultimately marked on the work 17 in the same positional relationship as the positional relationship shown for the image 21 of Figure 4 (original image 18 of Figure 2).
  • the third embodiment thus allows the patterns of the circumscribed area images 30 , 31 , and 32 separated from the original image 18 to be accurately marked on the work 17 in the same positional relationship as that for the entire pattern of the original image 18 .
  • this embodiment involves rotating the drive motor 8 of the scanning mirror 2 at a constant speed all the time and performing sub scanning at a constant velocity ve while the mirror 2 performs the sub scanning of the display screen 10 in the Y direction.
  • a conventional stepwise scanning mode as shown in Figure 16, when a single cycle of main scanning in the X direction has been completed, the speed of the motor 8 is changed in steps from zero speed to a predetermined speed designed to effect a transfer from its sub-scanning position Y1 to the sub-scanning position Y2 of a next main scanning and the mirror 2 is displaced by a small angle.
  • a disadvantage of this stepwise mode is that as the rotational speed of the polygonal mirror 3 is increased, that is, the main-scanning speed is increased, the tracking of the main scanning is impaired, and vibration occurs.
  • the constant-speed main scanning used in this embodiment makes it possible to overcome such tracking impairment and other shortcomings and to ensure that the main scanning speed is raised, that is, the marking time is reduced, without impairing tracking or causing other undesirable consequences.
  • the laser beam bm scans the display screen 10 diagonally, as shown in Figure 15, but this does not affect quality.
  • the unit of speed ve is equal to the unit of drive displacement L divided by second.
  • Equation (3) The aforementioned Equation (3) can be obtained in the following manner.
  • the scanning mirror 2 must scan the range L of the liquid-crystal screen 10 in the direction of sub scanning to allow the laser beam to scan the entire display screen 10 .
  • the scanning range L can be calculated using Equation (4) below by adding the width b of a single scanning pass to the both above and below the a longitudinal width a of the liquid crystal display 10 .
  • L a + 2b
  • the minimum value of the range L can be smaller than the Equation (4), however, it is better to adopt a slightly large L value, taking into account energy fluctuations around the laser beam.
  • Equation (6) can be obtained by generalizing the aforementioned Equation (3) and assuming that the polygonal mirror 3 has c sides.
  • ve c ⁇ L/60h
  • the sub scanning speed ve can be calculated basically if the following parameters are known: the required time ⁇ for a single cycle of main scanning, the number of times h the display screen 10 undergoes main scanning, and the longitudinal width a, which is the length of the display screen 10 in the sub scanning direction Y.
  • the required number of scanning cycles for scanning the aforementioned range L can be calculated using Equation (7) below on the basis of the diameter e of the laser beam striking the liquid-crystal screen. h ⁇ L/e
  • the controller 7 drives the motors 8 and 9 in controlled fashion in such a way that, as shown in Figure 18, scanning begins at the starting position St , and the laser beam bm scans the screen 10 in the direction of the arrow at the sub-scanning speed ve.
  • the aforementioned conventional stepwise scanning mode involves reading the switching period for the side 3a of the polygonal mirror 3 with a sensor, synchronizing the corresponding mirror surface switching signal (Figure 19(a)) with a scan mirror drive signal ( Figure 19(b)) for positioning the mirror 2 at the next sub-scanning position, and performing sub scanning.
  • the fourth embodiment thus allows the scanning speed to be increased without adversely affecting tracking or bringing about other disadvantages, and thus to reduce the marking time.
  • the conventional stepwise scanning mode is adopted when, for example, a predetermined threshold is set for the main-scanning speed, and this main-scanning speed does not exceed this threshold.
  • the constant-speed scanning mode of the fourth embodiment can also be implemented when the main-scanning speed exceeds the aforementioned threshold.
  • the switching operation time is always equal to the screen switching time ⁇ a and does not change even when any of the routes shown by the arrows in Figures 23 and 24 are selected as the display switching sequences (marking sequences) for the image segments 19 .
  • the marking time can be reduced by setting to either a marking procedure with the maximum number of travel cycles in the travel direction (Y direction) of shorter duration (the shorter of the two travel times ⁇ b and ⁇ c) or a marking procedure with the minimum number of travel cycles in the travel direction (X direction) of longer duration (the longer of the two travel times ⁇ b and ⁇ c).
  • the marking time is reduced to a minimum by setting the marking sequence of Figure 23, in which the travel in the X direction is reduced to a minimum (two cycles).
  • the fifth embodiment is implemented in view of the fact that image segments 19 sometimes have different longitudinal and transverse dimensions and that, accordingly, the time needed for an exposure position to travel across a work 17 is different for the X and Y directions.
  • reducing the preparation time ⁇ d for sub scanning is effective for reducing the marking time when the result of comparing times ⁇ a through ⁇ d is that the preparation time ⁇ d for sub scanning is longer than both the time ⁇ a and at least one of the travel times ⁇ a and ⁇ b in the X and Y directions.
  • a further time reduction can be attained in this case by selecting a rapid marking sequence in combination with the aforementioned fifth embodiment.
  • continuous scanning of a switching screen involves using as the origin a preset sub-scanning position Y0 for a display screen 10 and repeatedly performing scanning from this origin, as shown in Figure 26(a), but in this embodiment the sub-scanning position Ye reached when the entire scanning of one screen 19a has been completed serves as the sub-scanning position for the origin of the next screen 19b , and scanning is started from this sub-scanning position.
  • the first sub-scanning position Y0 is defined as the origin for the first screen 19a ; scanning is performed from the starting position St ( Figure 26(a)); the last sub-scanning position Ye, which is reached when the entire scanning of the screen 19a has been completed, is defined as the origin; scanning of the next screen 19b is started from a starting position St' ; and sub scanning is performed in a reverse direction with respect to the previous screen 19a ( Figure 26(b)).
  • the following two patterns may be adopted as the display switching sequences (marking sequences) for the image segments 19 that make up these images 34 and 35 , as shown in Figures 28 and 29.
  • One is a switching pattern in which at least two cycles of display switching are alternately performed between one image 34 and the other image 35
  • the other is a switching pattern in which all the display switching operations for one image (for example, image 34 ) are completed, and the operation then proceeds to the display switching procedure for the other image (image 35 ).
  • the marking time can therefore be reduced by selecting that of the two available switching patterns which allows marking to be performed in a short time.
  • the number of divisions of the image 34 in the X direction is n1
  • the number of divisions in the Y direction is m1
  • the number of divisions of the image 35 in the X direction is n2
  • the number of divisions in the Y direction is m2
  • the distance between the image 34 and the image 35 in the clearance direction (Y) is z.
  • the travel distance (transverse width of the image segment 19 ) per cycle in the X direction is x
  • the travel distance (longitudinal width of the image segment 19 ) per cycle in the Y direction is y.
  • the aforementioned clearance distance z can be calculated based on the coordinate positions of the images 34 and 35 .
  • Equation (9) the total number of travel cycles in the Y direction for the images 34 and 35 is expressed by Equation (9) below. n1(m1 - 1) + n2(m2 - 1)
  • the total travel distance D for this switching pattern can be calculated using the following equation.
  • D ⁇ n1(m1 - 1) + n2(m2 - 1) ⁇ y + (n max - 1)x + n min ⁇ z
  • the total travel distance D' for the switching pattern of Figure 29 can then be expressed as the following Equation (15) on the basis of the aforementioned equations.
  • D' ⁇ n1(m1 - 1) + n2(m2 - 1) ⁇ y + ⁇ (n1 - 1) + (n2 - 1) ⁇ x + z
  • the travel time for each pattern can therefore be computed once the travel times for the travel distances x, y, and z are set.
  • selecting the pattern with the shortest time of the two switching patterns and sequentially performing display switching and marking makes it possible to always obtain the shortest marking time for any positional relationship between the images 34 and 35 .
  • the amount by which the motors 12 and 16 should be driven in order to sequentially mark the work 17 with the patterns of the image segments 19 of the images 34 and 35 can be calculated in the same manner as in the third embodiment described above.
  • the present invention involves reducing the numbers of divisions when an original image is divided into image segments, and thus allows the marking time to be reduced.
  • the marking time can be reduced because the shortest display switching sequence is determined.
  • the marking time can be reduced because measures are taken to reduce the preparation time of sub scanning.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Image Processing (AREA)
  • Image Analysis (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
EP99116604A 1994-01-28 1995-01-30 Control device for marking device Withdrawn EP0961215A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP865994 1994-01-28
JP00865994A JP3258804B2 (ja) 1994-01-28 1994-01-28 マーキング装置の制御装置
EP95906539A EP0692335B1 (en) 1994-01-28 1995-01-30 Control device for marking apparatus

Related Parent Applications (1)

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EP95906539A Division EP0692335B1 (en) 1994-01-28 1995-01-30 Control device for marking apparatus

Publications (1)

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EP0961215A1 true EP0961215A1 (en) 1999-12-01

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EP99116604A Withdrawn EP0961215A1 (en) 1994-01-28 1995-01-30 Control device for marking device
EP95906539A Expired - Lifetime EP0692335B1 (en) 1994-01-28 1995-01-30 Control device for marking apparatus

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EP95906539A Expired - Lifetime EP0692335B1 (en) 1994-01-28 1995-01-30 Control device for marking apparatus

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US (1) US6046794A (ja)
EP (2) EP0961215A1 (ja)
JP (1) JP3258804B2 (ja)
KR (1) KR960700858A (ja)
CA (1) CA2159497A1 (ja)
DE (1) DE69526152T2 (ja)
WO (1) WO1995020457A1 (ja)

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Also Published As

Publication number Publication date
EP0692335A1 (en) 1996-01-17
DE69526152D1 (de) 2002-05-08
JPH07214350A (ja) 1995-08-15
KR960700858A (ko) 1996-02-24
CA2159497A1 (en) 1995-08-03
US6046794A (en) 2000-04-04
DE69526152T2 (de) 2002-11-14
EP0692335B1 (en) 2002-04-03
WO1995020457A1 (fr) 1995-08-03
JP3258804B2 (ja) 2002-02-18
EP0692335A4 (en) 1997-04-16

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